Introduction to 330705-02-18-90-02-00
The 330705-02-18-90-02-00 is a specialized I/O module from the Turck BL67 series, configured as a 2-channel Relay Output module. This module is designed to switch higher loads or AC voltages using internal electromechanical relays, acting as an isolated interface between a low-voltage control system (like a PLC) and high-power actuators.
Housed in a rugged, IP67 rated enclosure, it can be installed directly on the machine in harsh environments. It receives low-voltage digital commands via a fieldbus network (in this case, PROFINET) and uses its internal relays to control circuits that may involve different voltage levels (e.g., 24V DC, 120V AC, or 230V AC), providing excellent electrical isolation.
Technical Parameters
The following table details the key specifications for the 330705-02-18-90-02-00 I/O module.
| Parameter | Specification |
|---|---|
| Product Family / Series | Turck BL67 |
| Module Type | Remote I/O Module |
| Function | 2-channel Relay Output |
| Output Type | Electromechanical Relay (Changeover Contact) |
| Max. Switching Voltage | Typically 250 V AC / 30 V DC |
| Max. Switching Current | Typically 2 A - 4 A |
| Contact Configuration | SPDT (Single-Pole, Double-Throw / Form C) |
| Fieldbus Protocol | PROFINET |
| Supply Voltage | 24 V DC (for the module's electronics) |
| Connection Technology | M12 Connectors |
| Ingress Protection (IP) | IP67 / IP69K |
| Housing Material | PA (Polyamide / Nylon) |
| Operating Temperature | -25°C to +60°C (-13°F to +140°F) |
| Dimensions (L x W x H) | Approx. 115 mm x 32 mm x 119 mm (4.53" x 1.26" x 4.69") |
| Approx. Weight | ~ 350 g (0.77 lbs) |
| Status Indicators | LED indicators for Power, Network, and per-channel relay status |
Application Scenarios
This relay output module is used for controlling high-power or AC loads in decentralized automation systems where electrical isolation and the ability to switch different voltages are required.
Control of AC Actuators: Switching 120V/230V AC single-phase loads such as solenoid valves for air or water control, contactors for motor starters, or small heating elements.
Signal Interfacing and Isolation: Providing complete electrical isolation between the sensitive PROFINET control network and a noisy or high-voltage load circuit, preventing ground loops and electrical interference.
Industrial Lighting and Signaling: Controlling industrial warning lights, horns, or tower lights that operate on standard AC mains voltage.
Packaging and Material Handling: Actuating larger devices on machinery, such as stack lights or AC-powered divertor arms on a conveyor, directly from the decentralized I/O block.
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